/*
 ============================================================================
 Page	     : 177-178
 Name        : colddays.c
 Date	     : 20210403
 Author      : Hbue 18060333
 Copyright   : Your copyright notice
 Description : 找出0摄氏度以下的天数占总天数的百分比
 ============================================================================
 */

#include <stdio.h>

int main(void)
{
	const int FREEZING = 0;
	float temperature = 0;
	int cold_days = 0;
	int all_days = 0;

	printf("Enter the list of daily low temperatures.\n");
	printf("Use Celsius, and enter q to quit.\n");
	while(scanf("%f", &temperature) == 1)
	{
		all_days++;
		if(temperature < FREEZING)
		{
			cold_days++;
		}
	}
	if(all_days != 0)
	{
		printf("%d days total: %.1f%% were below freezing.\n", all_days, 100.0 * (float)cold_days / all_days);
	}
	if(all_days == 0)
	{
		printf("No data entered!\n");
	}

	return 0;
}

